CREATE TABLE IF NOT EXISTS notifications (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v7(),
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    type VARCHAR(50) NOT NULL, -- info, success, warning, error
    title VARCHAR(255) NOT NULL,
    message TEXT NOT NULL,
    link TEXT,
    read_at TIMESTAMP,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX idx_notifications_user_id ON notifications(user_id);
CREATE INDEX idx_notifications_created_at ON notifications(created_at);